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Abstract

Fig. 1 shows the pivoting idler wheel 11 mounted on shaft 13 which is free to pivot on pin 15 in a plane which is parallel to the plane of the document 17. Document motion is provided by drive wheel 21 which rotates under motor control. Idler wheel 11 is pushed down against document 17 by idler wheel 31 under the tension of spring 35 acting on shaft 33. As shown in Fig 2, drive wheel 21 provides drive force FD on document 17 in combination with wheel 11. Idler wheel 11 has a bearing where it is mounted to shaft 13, and likewise idler wheel 31 has a similar bearing. The friction of these bearings and rolling surface friction provide a drag force FR 11 and FR 31, respectively. These drag forces in combination with the driving force FD tend to move idler wheel 11 to the position 41 shown in dotted lines in Fig. 3.

Country

United States

Language

English (United States)

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Improved Bidirectional Document Aligner

Fig. 1 shows the pivoting idler wheel 11 mounted on shaft 13 which is free to
pivot on pin 15 in a plane which is parallel to the plane of the document 17.
Document motion is provided by drive wheel 21 which rotates under motor
control. Idler wheel 11 is pushed down against document 17 by idler wheel 31
under the tension of spring 35 acting on shaft 33. As shown in Fig 2, drive wheel
21 provides drive force FD on document 17 in combination with wheel 11. Idler
wheel 11 has a bearing where it is mounted to shaft 13, and likewise idler wheel
31 has a similar bearing. The friction of these bearings and rolling surface
friction provide a drag force FR 11 and FR 31, respectively. These drag forces in
combination with the driving force FD tend to move idler wheel 11 to the position
41 shown in dotted lines in Fig. 3. When drive wheel 21 is reversed to reverse
the motion of document 17, each of the forces FD, FR11, and FR 31 also
reverse, causing pivoting idler wheel 11 to move to the position 51 shown in
dotted lines in Fig. 3. In this way document 17 tends to be moved sideways
against registration edge 19 no matter which way the document 17 is being
moved.